Could these work for a 3.5mm double coil wire?

These cores come in various sizes, that you need 3.5 mm is accommodated in a 1.5 mm cable at least up to 3.5 mm maximum, and if it does not work, you can use the core of 5 mm, which fits into a 3.5 mm cable at least up to 5 mm and I think that the cable you have should fit well in one of those two cores.

what frequencies do these absorb

that depends on the length of cable they are being used on. It's the cables that act as antennas, both radiating and receiving signals. It may take multiple units on your cables to reduce/eliminate the bothersome signals.

Will these filter out a radio station leaking into my audio

It depends on the strength and the proximity of the transmitting station. Under most conditions, you may be able to minimize or eliminate incoming radio frequency interference by clamping these onto your speaker leads. It may take more than one if the signal is very strong.

20 Pcs Snap On Ferrite Core Cord Ring Rfi Emi

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Description

🔒 Lock in Signal Clarity, Lose the Noise!

SNAP SECURE DESIGN - Tool-free double snap closure for quick, hassle-free installation anytime, anywhere.
BULK PACK FOR MAXIMUM VALUE - 20 pieces included, ensuring you’re always ready to optimize your workspace or home setup.
VERSATILE APPLICATION RANGE - Perfect for USB, HDMI, audio, power, and industrial cables—keep all your tech noise-free.
UNIVERSAL FIT FOR EVERY CABLE - Five precision sizes (3mm to 13mm) cover all your essential cords effortlessly.
CRYSTAL CLEAR SIGNAL INTEGRITY - Effectively suppresses electromagnetic interference to boost your device performance.

This 20-piece set of black snap-on ferrite core cord rings includes five different sizes (3mm, 5mm, 7mm, 9mm, 13mm) designed to fit cables with inner diameters from 3 to 13 mm. Engineered to reduce electromagnetic interference (EMI) and radio frequency interference (RFI), these ferrite cores improve signal integrity across a wide range of cables including USB, HDMI, audio, and power cords. The easy snap-on design allows quick installation without tools, making it an essential accessory for professionals seeking cleaner, faster data transmission and noise-free connectivity.

Specifications

ASIN	B01N0AV746
Best Sellers Rank	#97,408 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #20 in Electromagnetic Interference Filters
Date First Available	November 9, 2016
Item Weight	4.2 ounces
Item model number	43237-2
Manufacturer	FORSUN
Package Dimensions	6.18 x 3.94 x 1.77 inches

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C$1602

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Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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20 Pcs Snap on Ferrite Core Cord Ring RFI EMI Noise Filter Black

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